MailSlurp guide agent setup

Title: Dark Mode Email Testing for Gmail, Outlook, and Apple Mail
Description: Learn how to test dark mode email behavior, prevent contrast and logo failures, and ship templates that remain readable across major clients.
Canonical URL: https://www.mailslurp.com/guides/dark-mode-email-testing/
Markdown URL: https://www.mailslurp.com/guides/dark-mode-email-testing.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.